Submission #208701

#	Time	Username	Problem	Language	Result	Execution time	Memory
208701		YJU	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	10 / 100	6 ms	1532 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef long double ld;
const ll MOD=1e9+7;
const ll N=3e4+5;
const ll INF=(1LL<<60);
const ll R=1e3+5;
const ld pi=3.14159265359;
#define REP(i,n) for(ll i=0;i<n;i++)
#define REP1(i,n) for(ll i=1;i<=n;i++)
#define pb push_back
#define mp make_pair
#define X first
#define Y second
#define setp setprecision
#define lwb lower_bound
#define SZ(a) (ll)a.size()

ll n,m,vis[N][R],dis[N],b[N],p[N],ti,x;
vector<ll> v[N];
priority_queue<pll,vector<pll>,greater<pll> > pq;

int main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	cin>>n>>m;
	REP(i,m){
		cin>>b[i]>>p[i];
		v[b[i]].pb(p[i]);
	}
	REP(i,n)sort(v[i].rbegin(),v[i].rend()),v[i].resize(unique(v[i].begin(),v[i].end())-v[i].begin());
	REP(i,N)dis[i]=INF;
	dis[b[0]]=0;
	pq.push(mp(0,b[0]));
	while(SZ(pq)){
		dis[x=pq.top().Y]=pq.top().X;pq.pop();
		for(ll step:v[x]){
			for(ll i=x+step,tt=1;i<n;i+=step,++tt){
				if(step<R&&vis[i][step])break;
				if(dis[i]>dis[x]+tt){
					pq.push(mp(dis[x]+tt,i));
					if(step<R)vis[i][step]=1;
				}
			}
			for(ll i=x-step,tt=1;i>=0;i-=step,++tt){
				if(step<R&&vis[i][step])break;
				if(dis[i]>dis[x]+tt){
					pq.push(mp(dis[x]+tt,i));
					if(step<R)vis[i][step]=1;
				}
			}
		}
	}
	cout<<(dis[b[1]]>=INF?-1:dis[b[1]])<<"\n";
	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43